Titanium Oxide Nanowire Clots with Two Phase Composition as Multi-Effect Sulfur Reservoirs for Lithium-Sulfur Batteries

Abstract

Lithium sulfur batteries (LSBs) is one of the most promising battery systems for both green energy plants and electric vehicles power sources. High performance sulfur reservoirs have been considered as the most important component for LSBs to protect the soluble lithium polysulfides (LPSs) from shuttling to lithium anode. Herein, a desired titanium oxide nanowires clots (TOCs) with a two phase composition and high effective absorption surface area (270.1 m2g-1) is developed as the promising LPSs’ reservoirs for the accommodation of sulfur and LPSs. Benefitted from the synergistic effect generated from the unique structure of TOCs, the obtained S/TOCs cathode materials exhibit high specific capacity, high coulombic efficiency and excellent cyclic stability at 1C and 2C rate. The corresponding capacity fading rate of each cycle is only ~0.14% and 0.11 % for the LSBs being (dis)charged 1C and 2C, respectively.